Question

How to cyclically rotate the elements of int array left N times in PHP

Answer 1

function rotate_array_left_one_time(&$arr) {
    $first = $arr[0];
    $arr_size = count($arr);
    
    for ($i = 0; $i < $arr_size - 1; $i++) {
        $arr[$i] = $arr[$i + 1];
    }
     
    $arr[$arr_size - 1] = $first;
}

$arr = array(4, 7, 2, 9, 3);  
$arr_size = count($arr);
$n_times = 3;
  
for ($i = 0; $i < $n_times; $i++)
    rotate_array_left_one_time($arr);
      
for ($i = 0; $i < $arr_size; $i++) {
    echo $arr[$i] . " ";
}
 
 
  
  
  
/*
run:
  
9 3 4 7 2 
  
*/

 

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